I don't think this one is my fault - but it could be.
the crossrefs for NA28-T are looking up the wrong reference.
that is, they're giving us the LXX references, which in the Psalms for example are often a chapter and verse out.
Accordance then takes us to not the chapter and verse after but to the reference as if it were the standard versification.
Looking at Hebrews 2.12.
Crossref: Ps 21.23
Hover over crossref: get shown Ps 21.13
Click the cross ref: get taken to Ps 21.11 (LXX 20.12)
again, happy if it's me. but guessing it's not.
(this is on the latest PR - not at home to check my mac).