Network and application session keys the same among all my ABP devices

As you can read in the explanation about the DevAddr I linked-to above, TTN will use the combination of DevAddr and NwkSKey. So I don’t think the non-unique NwkSKey is the cause of your problem.

However: any chance the current values for the uplink counter (for each device) are lower than the last known values, caused by devices resetting somehow? (If they use solar power then maybe their batteries might go too low at night?) If that’s the cause, then your gateway traffic should still see the uplinks just fine (and also show the current counter), but they would not be routed to your application. (Unless you disable the frame counter security.)

Beware that changing any setting for an ABP device will reset their counters. (When using TTN Console.)

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