Well the tag is slightly misleading as these players do not cause problems. However I have encountered several players who exhibit skills their real life counterpart has without actually metagaming. As an example I encountered a player while running storyteller system and while they didn’t have leadership skill they were quite fond of management stuff and assigned people that were under their command. On a similar note I had a player in D&D 5e who did not have survival proficiency (or nature proficiency for that matter) but he explained how his character set up a rudimentary water purification system.
I thought of a few solutions for this.
Just tell them no. While this solution feels like the correct one my players often get excited when they utilize things like this and I don’t want to be the GM that says ‘No fun allowed’.
Ask them to switch their proficiencies/skills to better reflect their knowledge. This feels a bit too punishing and I feel that it might end up causing them to not have the character they had in mind.
Just let it fly. This is what I have been doing so far but to be honest I feel it is hurting other players and stealing the spotlight from people that invested in the required skills.
The main question is: How can I handle a player who seems to utilize skills their characters don’t have?