In Jira, I see all filters that I have created (about 40). But when I use the app from my mobile phone, I go to issues and it shows a list of saved filters but I cannot find some of them. I use the app Jira version 37.0.369
Welcome to Atlassian Community!
I created 40 new filters on my test site, using the names from Filter 1 to Filter 40 to be easier to count and all new filters were showing correctly on my mobile.
My app version is 40.0.385 on Android 8.1.0.
Can you please let us know if you are using Android or iOS and the version?