SIRS is actually an LP token and xPlenty is the redemption token for staked Plenty. They will show up in liquidity or the staked tabs so no need to be in the portfolio tab.

SIRS: https://tzkt.io/KT1AafHA1C1vk959wvHWBispY9Y2f3fxBUUo/operations/

xPlenty: https://tzkt.io/KT1Rpviewjg82JgjGfAKFneSupjAR1kUhbza/operations/