"oldest first" sort not fully sorted

When sorting a feed by “oldest first” I notice it often isn’t. However “newest first” seems to be OK. Anybody else seeing this?

Tiny Tiny RSS v17.12 (#2c51facf) running on EC2, viewed with chrome 56.0.2924.87 on Linux.

Attached a screenshot of the date column from a feed today.

datecolumn

oldest first is sorted by import batch timestamp, then feed specified timestamp because the latter one is unreliable

in the future please search before posting (yes this also includes /oldforum/)