Your progress only saves when you either quit or the game ends, unfortunately if you leave the game by any other means it wont be saved; although your inventory is updated automatically.
From the character packs of levels 4-10, in 5 of these packs you will get a character piece. The last character piece to unlock the character will be at level 10 and therefor you would have unlocked that character.
Could you please post the levels and pieces remaining for each of the progression characters you're missing? Just so everything is consolodated and easy to read.
Soldier - Camo Ranger
Engineer - Welder
Scientist - Chemist
All-Star - Baseball Star
Peashooter - Fire Pea
Chomper - Toxic Chomper
Sunflower - Metal Petal
Cactus - Camo Cactus
Didn't you have a problem with your stickershop before? Could have been possible you leveled up and had those new packs unopened when they were multiplying. When they removed them, the new packs would have been removed aswell?
Soldier level 7 - Camo Ranger 3 (605,604,601)
Engineer level 6 - Welder 4 (748,746,744,747)
Scientist level 6 - Chemist ALL NEEDED
All-Star level 10 - Baseball Star 1 (1028)
Peashooter level 12 - Fire Pea 1 (19)
Chomper level 10 - Toxic Chomper 0
Sunflower level 6 - Metal Petal 4 (189,192,193,191)
Cactus level 7 - Camo Cactus 3 (449,453,452)
