Inconsistency in providing answers in Drag & drop
For some reason H5P drag & drop is inconsistent in providing answers.
Specifically: right answers are judged as being incorrect (which sort of spoils the whole thing), while the next time you perform exactly the same exercise they are considered to be correct. (The programming is done correctly.)
Any body any clue how one thing can be incorrect and then correct the next time? Any clue or guess would be appreciated, I just can't find a pattern in it.
Please see the screenshot, with something being judged incorrect and on the next screenshot it is correct (with no alterations in the programming in between).
Thanks for any help.
PS: It is a WP-site and this problem occurs on all devices.