I'm on my 3rd mech keyboard, after having tried a couple that didn't work out which were returned to Amazon. I've not had such problems with any of them though, nor have I ever heard of such problems.
So it's a bit of a head scratcher for me, but I can tell you along the journey of deciding what mech to buy, I read that some of them don't work well with other brand hardware, mainly due to things like their included software. Even Corsair as big as they are, has many problems still with their iCUE software causing such issues.
I happen to not be affected much by such 3rd party software because the main culprit is usually specifically the RGB lighting code they use in it, and RGB has never interested me. I only care about it's physical performance and am OK with just one solid backlighting color.
So the thing to do to test for what might be causing such problems is actually to NOT install the included software. If it installs automatically, see if you can remove it in Control Panel> Programs and Features. This of course won't give you all it's features, but it very well may tell you what's causing the problem. A TON of people new to mechs go through many brands/models before they find one that's right, so buying from a place like Amazon that will allow full refunds within a month makes sense.
This doesn't mean ALL such 3rd party software has such issues, it's actually more common in the big brands that go to the extent of making such software sync with all other components/peripherals they make that support it, such as iCUE. This could be why your cheapo membrane board didn't have such issues. It really depends how sophisticated that 3rd party software is, but after having read many reviews on brands that do the syncing thing to other products in their line, and having talked extensively to Corsair about it, I would say avoid the syncing type software like the plague, because as far as I know, it commonly causes problems, and the manufacturers either aren't sure how to fix it, or don't care to in hopes that customers buy more of their product to sync with it. To me, it's an unnecessary risk to take.