Bug in tables column data in postgres database

Hi Team,
I am a backend(server side) developer and I am using postgres database for
storing my data to database. I have find a big challenge working with
postgres database(version 13) as I have find major issue working
with column in table of database as data keep toggling its value.
eg::
if I have stored data into table
bike_table
======================================
bike_name bike_prefix bike_line
V111 V 111
W222 W 222
X333 X 333
===========================================

if some other time if query is made for same table data might look like this
bike_table
======================================
bike_name bike_prefix bike_line
W111 V 111
X222 W 222
X333 X 333
===========================================
So usually bike_name keep changing its name thats seems to me a toggling
behaviour.
Please take this issue as bug and work on this.

Thanks and Regards,
Sarita