cannot resize text!

I have been using this app since the year they were available in iOS device, I am a paid user and never have I been so frustrated since. I always resize my watermarks to smaller sizes so it wont distract the focus on my photos but I recently CANNOT do that. My fonts size is stuck to 19 and it has always been like that for a couple of weeks already no matter how many times I try to decrease the size, it always goes back to 19. Please fix this glitch and will be happy to change this rating to more stars.

street owl about Phonto - Text on Photos, v4.7.2