Why doesn't "UNDO" button work properly?

Well, it’s not the first time I’ve seen it and it’s already bothering me very much. Earlier I fully trusted, that, when I press “UNDO” button or hot-button it with “delete”, I can retake the answer without worry.But now I don’t think so: with old grammar(that is already at point 8-9 for me), I sometimes make a mistake or take a little time to answer correctly. For example, yesterday I hit the grammar " しましょうか", which should have reached level 10 . I made a few mistakes, remembering that I should plase “か” at the end. I reanswered the question and moved on. But today I see that this grammar has level 0! Well, I am indignant, it’s not the first grammar that has such problems, but 5-ft or even 10-th. For me, forgetting “ka” doesn’t qualify for an error, because I study here to be able to read and only when I mastered reading, I will go for writing, so I don’t care about little mistakes if it doesn’t affect my understanding. I spent a ton of time to reach level 9 for these grammars, but now they are reverted to 0. Can someone tell me what the heck is going on? Perhaps it’s a bag, or admins think they know better how should we study, not allowing a single reanswering at a higher level? I suppose it doesn’t happen in low levels or at least I don’t see it.

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Well, now even my notes are deleted. I don’t even start saying about the furigana, that is sometimes jumping in-between(when blocked, it appears, and when you wish for it to always appear, it goes back to being blocked).
Site has serious, direct reviews issues, I wonder where admins are looking.

@EndGlory Hey! We apologize for the inconvenience. We are not able to reproduce these issues on our end. Would you mind letting us know what browser/OS you are using? Do you have any extensions or scripts running? Any information that you could provide to help us get to the bottom of these issues would be greatly appreciated. Cheers!

Google Chrome with last update, Windows10x64bits, no scripts. The problem usually occurs with high-level items(at least, I didn’t notice trouble with the low-level ones). The last disappeared note I made existed for about a few days(2-3), the process of retaking the answer above(delete via backspace + a few tries earlier).