I would reseat it again while checking it’s not that the inner tube or rim tape is twisted.
*Disassemble
*Deflate inner tube and inspect
*Sprinkle talc in tyre.
*Fit half the tyre to the rim
*Check rim tape
*Inflate inner until it is just a toroid
*Insert/seat valve. Locknut loose!
*Lie wheel on knee, work tube into tyre void/volume. Ensure even tension, no creases. Adjust pressure if necessary to “fit” tube to tyre void.
*Centre tyre over rim
*Tuck other bead over rim profile
*Work around both sides of the tyre with your thumbs adjusting/centring the bead as best possible.
*Inflate to 15psi, recheck bead. Ensure locknut is resting against the rim afterwards.
*Fully inflate if looking good. If not aligned/lumpy/twisted fix before riding or the tyre may deform and not go on straight in future.
*Tighten locknut slightly.
Really uncooperative tyres can be aided with soapy water or loads of talc, but they can then also pop over the rim if they’re quite loose fitting.
Good luck!