Max I wouldn’t even know what fees would apply that’d have to be paid by the payee.
Credit card processing fees. For your account the fee structure is still 0.5% that are paid by the payee. That's why you get to these amounts. (2 cents when paying 5 euro etc.) This will change soon, however. The change was announced in early April. Now it'll be 2.5% instead, but paid for by the owner of the bunq.me page.
This means that in the future if someone pays you 5 euro on your bunq.me and chooses credit card payment, you'll effectively only receive 4.87 Euros, as you'll be billed 13 cents as a fee for accepting it. The payee however will not anymore get charged 5.02 Euros, but only 5 Euros so this source of "confusion" will go away.
Here's the info page about this change from April: https://together.bunq.com/d/26526-update-on-pricing-for-bunq-me-credit-card-payments It doesn't explain it in detail, but that's what changed. The change will come into effect next week iirc. (Edit: Actually from tomorrow, see https://together.bunq.com/d/26300-additional-questions-about-the-supergreen/54 )
To make this clear, fees are only charged for credit cards and debit cards. There are no additional fees for payments via iDEAL, Sofort or other methods. And I think this is pretty clear on the bunq.me page. My account is also still on the old fee structure and it looks like this when sending 5 Euros. You can clearly see that when selecting card payment, that a 2 cent fee is added.