Being charged postage as a seller

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Hi I'm a little confused I sold an item for £4.50. I always get the buyer to pay postage with simple delivery. So ive always just received the money for what the item has sold for but on this occasion I was paid £5.78 and says the buyer has paid 0.87p postage but I need to pay the postage which cost me £2.69. Im now out of pocket because my total earnings are £2.68 instead of the £4.50.

Also the postage said royal mail but when i scanned the barcode in the shop it come up as yodel.

I know this isn't a huge amount of money I'm just trying to understand why ive paid for postage.

Thanks Laura.