even after deleting the 1st key pair, owner's trust is defaulting to ultimate

[war.dhan]

i have created a key pair using the defaults at first.
et the owners trust as ultimate using enigmail 1.7.
then i realised about not adding :
personal-digest-preferences SHA256
cert-digest-algo SHA256
default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES
CAST5 ZLIB BZIP2 ZIP Uncompressed
since i have not uploaded the key to public server, i immediately
deleted the key.
added the above three lines gnupg.conf.
created a key pair with same credentials for both key pairs:
name: myname
email: myname at email.com

to my surprise the 2nd key pair has owners trust as ultimate.
is this intended behaviour or is anything abnormal ?
or is there any specific reason ?

i am using gnupg 2.0.25-1 on manjaro.

thanks & regards,
war.dhan