You hold USDC on Ethereum — paid out by a platform, left over from a DeFi position, bought on an exchange that favours USDC — and the next payment has to be USDT on TRON, which is what most invoices and deposit pages outside the United States ask for. Two dollar tokens, two issuers, two networks: one swap.
No single transaction changes the token and the network at once. Your USDC is received at an Ethereum deposit address, confirmed, and USDT is then transferred on TRON to the address you gave. The amounts are close to one to one but not identical: the rate between USDC and USDT floats by a fraction of a cent, and the estimate includes the fees of the payout.