Definnetly get those mounts butt up against each other. Depending on what hardware is up in the blind track ( and it looks like the where set right with the adjusters to the outside ) you may be able to take a hack saw and trim the track just slightly like even a 1/16th off each end will end up getting that gap don’t an 1/8. Etc etc. Or you may be able to find a center style track for a long single blind set up. And get the two ends in there instead of two end caps. It seems excessive BC there will always be some small gap.