No reads on either hand because I am new to both tables.

Both flops are good flops for cbetting, so I am really confused by these lines.

If a line does not make sense should I lean more towards calling or folding??

(In hindsight I should have bet more on the turn in Hand 1)

Hand 1

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
UTG: $108.90
CO: $64.30
Button: $103.85
SB: $100.20
Hero: $126.10

Pre-flop: (5 players) Hero is BB with J K
UTG folds, CO calls, Button raises to $3, SB folds, Hero calls, CO folds.

Flop: J 3 T ($7.5, 2 players)
Hero checks, Button checks.

Turn: 6 ($7.5, 2 players)
Hero bets $4, Button raises to $15, Hero

Hand 2

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
UTG: $98.50
CO: $56.10
Button: $8.60
Hero: $101.20
BB: $131.35

Pre-flop: (5 players) Hero is SB with 9 9
UTG folds, CO raises to $3, Button folds, Hero calls, BB folds.

Flop: T 7 T ($7, 2 players)
Hero checks, CO checks.

Turn: 6 ($7, 2 players)
Hero bets $5, CO raises to $15, Hero