Maximum light fixture wattage question
Are these on a dimmer, perhaps? Dimmable LEDs need an LED-rated dimmer to be happy, generally. If the dimmer is old that usually means replacing it.

You have not increased the wattage. The Wattage is 15W per bulb - the "equivalent wattage" is marketing organic fertilizer meant to convey the lumen output relative to an incandescent bulb. It has nothing to do with actual wattage.

You may have an issue where the base of the bulb is too fat, too soon for the fixture socket, so that no contact is being made to the center contact. Depending on how extreme this is it can sometimes be helped (circuit breaker for the circuit OFF, please) by gently, slightly, bending the center contact in the socket up just a bit - but if you overdo it you can snap the contact off, so don't overdo it.