I thought it continues and continues to increase 1 point per tick with your spy sat on your colony..is there a limit or something?

Thanks in advance for explanation

If someone has put lets say 50 ticks of spy protection on your colony every tick you lose 1 spy pro put the spy puts it back on so in this example you wouldnt gain any spy pro in 50 ticks but afterwards you would

there should be no limit, u can increase ur spy pro to plus infinity...

Hmm well unless ive just read the previous posts wrong, think i may have a bug. I have been trying to maintain 50 ticks spy protection above the tick to give me leeway should my spy go wandering and yet b ultra protected. With that in mind my spy has remained on my colony other than when i was getting nuked. Well that was a while ago. Just checked my screen yesterday and my spy protection is back down to around level of game tick so my spy sat on my colony has had no negating effect.

Main ship or agent?

considering you can`t put an agent on your own colony obviously he means main ship.
and every tick your spy is there should add 1 point of pro,even if you spend e to boost the pro , the main spy should continue to add pro.So either you found a bug as you say or your spy spent longer off colony than you thought and you failed to check your pro level after it dropped.