Several of the stocks you owned through Swell likely paid
dividends to shareholders. Dividends are usually paid quarterly, as of an
announced
ex-dividend date.
If you owned a stock as of
the ex-dividend date, then sold the stock and withdrew your funds before the
dividend was paid, then the dividend would deposit into your (now) empty Folio
account.
This will increase your Folio account balance from a
few cents to several dollars, depending on how much you had invested.
If
you initiated an account transfer, Folio will forward these funds to your new
brokerage account. If you withdrew funds to your linked bank account, you will
need to request the remaining balance from
Folio.