There's a bunch of different ways to test IQ, and most if not all tests are known to be pretty flawed. The concept of intelligence being something that can be compared on a single numeric scale is in itself pretty much bullshit - there are different types of intelligence, and the tests tend to focus on random things like pattern matching.
A bunch of "high IQ" people are barely functional on a day to day basis. Basically low scores on an IQ test indicates that you lack the skills to do that exact test - I wouldn't read too much into it.
Edit: Read another comment where you elaborate and don't want to come across as dismissing your experience at all, I can see that it's frustrating when people keep insisting it doesn't matter. But having completed my PhD and having met a lot of people that would do incredibly well in IQ tests, I can safely say many of them too face significant challenges in lives deriving from their lack of situational awareness and understanding of for example social situations.