bdr.bdr_sequence_values is a BDR internal implementation table used for Global sequences. Do not modify this table directly.
This table keeps track of which global sequence chunks (value ranges) have been allocated to which nodes. It does not show which sequence chunks have been used up. (That knowledge is only kept track of by the local sequence on a node its self in the opaque binary amdata field of the sequence, so it's not really accessible).
You should never need to access this table.