Thanks for reaching out! I don't have too much information to work with, but I've seen a similar behavior occur when device-specific layouts were used. This can be setup accidentally and are different than the Default dashboard layout/sizing. More information can be found here: Create Dashboard Layouts for Different Device Types
Hope this helps you get started!
I agree with Jason's response.
One other thing that may be going on is that your filters aren't actually disappearing, but just shrinking so small that nothing displays. This is a common problem with using Automatic sizing. This is why I generally use Fixed sizes for my dashboards these days. I have found that Automatic sizing is cool, but problematic when people use drastically different device sizes.