Added a new URC MX450 to and existing (already in house) ATT uverse box that was using a Proficient IR repeater (ATT box in cabinet below TV).

all worked fine with ATT remote, but when using the URC - the number press buttons worked erratically - press "1" and "11" would appear. number inputs lagged or would double.

when I use the URC directly to the ATT box (bypass the IR kit) it works fine.

is there a known IR repeater kit that works well with URC and ATT boxes ya'll use?