dapenggaofei happening on my android. I have quite an old android too if that helps.
Chapter only has half
IronWielder didn't work for me
Amylee plz give us a screenshot
Thank you so much.I tried Clear cache.it works.
Mangos can you tell me your app platform and app version
Amylee can you tell us your app version
ReachZhaiTW added the Android tag.
ReachZhaiTW its too many steps to upload screen from app to forum. Add upload option and not that !command crap...
Smailig2 can you send an email ，plz？we have a video ，you can watch the video step by step ，send cache file to us
ReachZhaiTW version 2.7
IronWielder
Didn't work for me. 
ahnya72 okay, I assume you are on android app. Here is the step I do whenever I encounter this bug. From library, tap profile on bottom left, then settings and tap the clear cache. Go back to library, tap the affected novel. If you can only see the unlock using ss button and nothing else, go back to library, and tap the novel again. It will reset the novel reading synchronisation to chapter 1. So, go to the latest chapter using the left side chapter list, this fixed it for me. If you still affected, then you have to wait for them to fix it, sorry.
Smailig2 update app to V2.7.1
ReachZhaiTW added the Fixed tag.
Amylee Update Webnovel to V2.7.1