I haven't seen anything like that on mine, but I will keep my eyes out!
Out of curiosity, how many miles/kilometers do you have on it?
This is the thing, this is my third ride. I haven't ridden the bike much at all due to work, weather, and other responsibilities. I've probably put less than 150kms on this frameset.
TBH the bike looks great, and rides really well, but the build experience has been sub-optimal. The rear shifting is poor as I had to run a fully covered cable to the rear which has made the shifting very inaccurate (sometimes you have to shift down two gears then back up one to shift down, and vice versa).
I also have a CFR1056 and struggle with keeping the headset tight.
In fairness I also have a Yeoleo R12 which I'm building and the experience there has also been unsatisfactory.