What's causing when I edit posts that URLs and some other data is lost

I've been banging my head about this one for a couple of years across several Windows installations including 7, 8, 8.1 and 10 at home on two PCs and Windows XP (I think) and 7 at work, on multiple laptops, and taking place in both Chrome and Internet Explorer 9, 10 and 11. I have Edge uninstalled in Windows 10 so I can't test that at the moment. I forget what result I had with Firefox, but I'll probably reinstall it to find out.

It's most annoying when editing an OP but whether with an OP or regular post, I've occasionally worked around the problem by keeping a "master" copy of the post in Notepad++ on Windows, editing that, then copying and pasting that to my post edit. This only works when I either already have a current master copy in Notepad++, or can manage to retrieve an uncorrupted copy which is sometimes difficult when the problem happens in all my currently installed programs.

The problem also occurs when editing a DevDB project in both Chrome and Internet Explorer.

The problem happens most frequently in Chrome so my most common solution was to temporarily switch to Internet Explorer, but right now even IE is giving the same result.

I'm very good at searching and I've tried searching both Google and XDA with different sets of search terms and I don't find anything even remotely similar.

For example, the following correct text:

Code:

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First, the thanks:
 @AndroidFileHost for the Android File Host website and especially their changes allowing for the reorganization of already uploaded files.
 @KyPbP for letting us know it's availability and giving the link to download the VK810 35A_08 KDZ.
 @hsbadr for giving me permission to kang his Verizon G3 VS985 JasmineROM 7.0 update script for this use.
 @rant for giving a link to the official Verizon PDF detailing this release.
 @Chainfire for SuperSU!
 @Hnk1 for continued support, advise and ideas, and for experimenting to find out how to root 35A_08 without downgrading.  His two updated guides:

[VK810][Altev][Guides][Information] Root Recovery Repair [4.4.2][5.02]
[VK810][ROOT][Lollipop][5.02] No downgrade required

Debloat scripts that you can flash in CWM (ClockworkMod Recovery) after flashing the ROM and SuperSU.zip are located in the second post.

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after clicking the Edit button becomes:

Code:

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First, the thanks:
 @AndroidFileHost for the Android File Host website and especially their changes allowing for the reorganization of already uploaded files.
 @KyPbP for Root Recovery Repair [4.4.2][5.02]
letting us know it's availability and giving the link to download the VK810 35A_08 KDZ

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becoming:

Code:

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@KyPbP for [URL=" us know it's availability and giving the link to download the VK810 35A_08 KDZ[/URL].

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If this were only happening in Chrome, I would suspect an extension. I've had the problem happen on completely new and clean installations of Windows as well.

Thanks in advance for any advice.