Where did you come up with the conclusion that this is because of fixed signs being in your cadent houses?.. It is pretty basic astrology that there are different aspects between signs and that signs in your group (cardinal, fixed or mutable) most of the time will do harsh aspects to each other (opposition, square). If you're an aquarius sun your sun will be doing squares to taurus and scorpio and oppositions to leo. If you have a different moon sign it will make other aspects to those planets (also that might put a harsh aspect in your chart like sun opposite or square moon). Squares can show sexual attraction or passion but it will also show difficulties between two people. Sister signs (leo and aqua, scorpio and taurus etc)do like each other because they complete each other in a way but in aspects an opposition between two planets can give difficulties as well.
People can be very attracted to the signs that do squares to their signs but they can also have difficulties in relationships. I'm a cancer sun w libra moon, liked a guy that was Aries sun with libra moon, we liked each other vey much but we were fighting all the time because our planets were doing harsh aspects. ( sun square sun, moon opposite sun, moon square sun, only positive was moon conj moon) and this was just the sun and moon aspects. We were very jealous and I felt like he didn't understand how I wanted him to communicate and he felt the same way(this is because of squares and oppositions) Also sister signs can like each other very much because in some ways they complete each other but they can also dislike each other because some of their opinions and behaviours will be the opposite.
My descendant is in pisces so I should loove the energies of pisces and neptune, but I don't. I actually dislike their energy, pisces seem to like me and I find them attractive at first but their behaviour and look at life and opinions is usually exactly the opposite of what I think. I literally get frustrated when I talk to them because we can't agree on anything. But my venus is in virgo in the 1st house conj the ascendant aka opposite the descendant. So when I meet people with planets in pisces my venus will be doing oppositions to their planets. So I think maybe look at the planets and their aspects to eachother and to other people first, and then their aspects to the angles (1,4,7,10 houses). And if you have any plantets in those cadent houses you can look at what aspects they are doing as well.