That means your TL (training load) is enough to maintain your TP but you haven’t fully validated your signature values during that time.
See this post for details –
MPA on Endurance Rides - General - Xert Community Forum (xertonline.com)
Reference – Breaking Through the Xert Way! – Xert (baronbiosys.com)
Examples – Let’s See Some Recent BT’s - General - Xert Community Forum (xertonline.com)