Brake fluid reservoir HELP

It’s been a while since I posted on here but it was extremely beneficial when I did…. thank you.

A few weeks ago I noticed on both of my 2015’s brake reservoirs on the handlebars were leaking from the gasket in between the cap and housing. Both have been garage kept since new and don’t take many trips to mud…. is this a normal Polaris thing? I’ve had Hondas 10-15 years old that never had that issue… just curious if a temperature change will cause enough expansion to overtake the gasket. Both caps were hand tight as I’ve never checked them until now. Both seemed to be on tight enough to seal and remain sealed. Any help much appreciated.

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