Two hands same line different villain.

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

i'd fold both hands because in these situations when someone doesnt cbet those boards it means monsters.

I have no idea what these lines mean without a read. In hand 1 I fold pre-flop. He could be sensing weakness from your small turn bet and making a move, but it's probably going to cost you another bet to find out. I'm closer to calling this one but still fold. In hand 2 the guy's a halfstack and they love to slowplay their high pp's. Again, if he's bluffing I doubt he gives you a free showdown.