I’m sorry. I didn’t know it had to be the same exact shape.
I’ve tried again using your image as the reference (it is a hidden layer): https://designer.gravit.io/?token=KukNQiwYrwyLwwMoGaL5LMI-97o3oqhL and I think it can be related to the way of doing things. I noticed you use the alt key, breaking the curves as you design and I design the 3 points first and create the curves later.
I’m not saying there is a right way of doing things as both should work, but while we’re still investigating the issue, to narrow down the source of the issue, maybe using my method could be a good workaround.