Hi,
I'm facing the same issue and it even occurs when I preview on Rise itself. So it's not an issue with the LMS. Please see this recording.
As you can see in the recording, I'm previewing on Rise 360 itself (Not our LMS). Yet, after clicking on all the interactive buttons and completing them, the continue button gets unlocked which means that I have completed the interactions in this section, but once I scroll down to the next section, the previous section gets marked as incomplete again and the interactions appear once again as if I never clicked on them.