While How I Met Your Mother had some unresolved plot holes, one of the sitcom’s most egregious abandoned stories came in the form of a fight between Ted and Robin. A lot of plot holes point out practical problems with the pacing of a plot or logical issues with the storytelling featured in a work. However, sometimes plot holes are more concerned with character inconsistencies. For example, in How I Met Your Mother, it doesn’t add up that Barney spent years secretly working to take down the amoral financiers behind Goliath National Bank when he spent the same years acting as an incorrigible cad to friends and romantic partners.

https://screenrant.com/how-met-your-mother-ted-robin-children-fight-bad-reason/