Found a hidden repeater

[LeoG]

By accident.  Apparently there is a 625 repeater that I know about, but he also has a 600 repeater I didn't know about.  My repeater operates on 600 with a PL of 100 and apparently his is on 103.5.  I can trigger his repeater on occasion when I key up. 

I noticed when I keyed up the other repeater would activate and it's a much stronger signal than mine.  It would block out mine for a second before it released.  One day I moved my TX PL and found it was only 1 click up from what I was using.  Not sure if my radio PL is wobbly or the selectivity of his repeater is lax.

Either way I've decided to change my PL to stop the interference.