I tried a few different things, but cannot get the bend to fail, even after multiple closing and opening the file in 2018. and given that it looks like others have downloaded the file, and not commented on a problem, I assume they couldn't replicate the fault neither. Why your bend angle is being converted to the degree equivalent of 1 radian, I've no idea.
I tried bend sheet and bend tube, both work fine every time, after multiple saving / opening of files.
Normally for 'odd' faults I'd suggest deleting built in folder or repair or re-install, but on this occasion I'd suggest having a word with IMSI Support.
. The only odd things was, according to the tcw file, you are using TC 2018 build 50.1, whereas I only have build 49.0. Whether this is because you have a German version I don't know. Maybe someone with build 50.1 can check the file. But I would advise contacting support, and pointing them to this thread. (though they may not be in work until Monday).