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There's a thicker bit of rubber around the valve, before you inflate the tube more than enough to hold it's shape a little when installing, push the valve up into the tyre, it should pop this bit from being stuck under the bead and get rid of the bulge that can become a boom if you inflate it fully.
snottyotter
Fitted some Conti 26” MTB tubes from wiggle on my bike w Vittoria booze lights (2.3in or so wide). When I inflate them properly there seems to be a bulge in the tube around the valve area which causes the tyres to rub on fhe guards. Only time this has happened it’s when I was a teen being cheap trying to jam a too big tube in. Any idea what might be going on? Have checked and the tubes were sold as being able to take up to 2.5” tyres.