postgresql partitions partition of table from to inclusive

When creating a range partition, the lower bound specified with FROM is an inclusive bound, whereas the upper bound specified with TO is an exclusive bound.

So in fact in

CREATE TABLE parsel_2014_10 PARTITION OF parsel_part 
     FOR VALUES FROM ('2014-10-01') TO ('2014-10-31');

the date 2014-10-31 is not included in this partition, and hence nowhere in all your partition tables (and same for all ending dates)

See the example at: https://www.postgresql.org/docs/10/static/ddl-partitioning.html#DDL-PARTITIONING-DECLARATIVE