If your bulbs are like these
https://www.speedwaymotors.com/Halog...Pins,7227.html from Speedway they consume about 60% more amps than standard 1157 bulbs. You flasher works on how much current (amps) are going through it. Increasing the current makes it flash faster (until it burns out). Call Speedway (or wherever your bought the bulbs) and ask them what flasher to use.