Multiple "Missing type signature" messages for a single method (which already has a type signature)

I have inherited a Ruby project which didn't have any type information for any methods nor properties, so I've started defining them in *.rbs files (and using rbs v3.6.1).

What I can't understand is that, with some methods (not all), I'm seeing multiple issues from Rubymine about “Missing type signature”. 

This is after defining the type signature (because you can see the parameters decorated with the type info in the screenshot). Before I created the signature in the RBS file, there were four lines about the missing signature, so my signature is where Rubymine can find it (I'm using the same place it took me when I clicked on “Add type signature”, after all. Here's what the signature looks like, btw:

Any suggestions on how squelch the multiple reports in Rubymine (and how to get it to recognize that the signature has been defined)?