2 ovulations in one month???

So here's a little about what's going on, in the begging it said that I was going to ovulation on the 5-8 but then I took a OPK on the 29th and the 31st and it was positive and got another one today, so because of that it changes my chart to being fertile on the 28th-2ed and then again on the 20-27 or so.