Did you receive them or have you saved them yourself?
It might be a Mis-seeding(i know you are careful),
or it might be a “stray seed”.
It could also be a “Cross” pollination result.
Even established seed(s) varieties can; or Seed Companies
CAN DIFFER in “Variations”: (WINK)
SAVE THE SEEDS from those tomatoes.
Particularly if they are GOOD.
When the Toms are ripe, Evaluate everything about them.
Size, Wgt, Color, skin depth, texture, flavor:-sweet-acid.
You never know Abner.
You just might have a DUD or a WINNER, or something that
is between and can be grown into something better.
JJ61
I bought them from Burpee.com when I couldn’t find any yellow pear seeds in my area. This is my first attempt at gardening. I planted them in jiffy 7s. I had a whole tray of 12 YPs. This is one of the surviving 4.
I’ve killed a lot of stuff this year. ;-)
I’ve been taking pics of everything since I started.
This particular plant looked ‘normal’ until about 2 weeks after I transplanted it into the garden.