bleed over

Please help, I have a minitor 3 and I have programed it to my specific two tone frequency, the problem is that another house has a similar group call and when they are toned out my pager goes hay wire.. I don't know if it's because the tones are to close to each other? or my maybe their is...

I just got a Pro-2026 and some of the aircraft frequencies are bleeding over into some of the marine frequencies like 156.700 What gives? Do I just need a tune up? Is it worth it? Is there something I can do? Thanks in advance, BDL