Day 25 of my 31 day cycle, i have had 5 positive opk tests five days in a row, i am always regular and have no issues, what could it be?

It is puzzling ...: As you know, the positive ovulation predictor measures LH (luteinizing hormone) that should rise before ovulation. Your question suggests your cycle is always/usually 31 days in length, so I agree day 25 should be beyond this. Usually only positive 1-2 days. 5 ???. Presume not taking Clomid (clomiphene) which can cause false positive. Use another brand next month; if abnormal,MD eval for LH producing condition