Recently, someone in the group has been watching large on-chain transfers and hot/cold wallet movements on exchanges, saying "smart money is coming" whenever there's activity.

As a result, I often experience data lag on my end, which is really not a conspiracy theory...
Many times it's because the indexer isn't keeping up, or the subgraph (on-chain data indexing service) is rebuilding/delayed, causing the front end to suddenly go "blind" for a few seconds.
Plus, with RPC rate limiting, when you make too many requests, they queue up or timeout, making the page spin around, as if funds are teleporting.
Anyway, when I see anomalies now, I wait a bit, refresh twice, and if that doesn't help, I switch data sources before drawing conclusions—don't jump to conclusions or imagine things.