R..Shimon bar Yochai argues on the Zohar-Parshas Yisro

Yerushalmi Shekalim
Perek 6 Halachah 1 (16b)

How were the Luchos written?

1) R. Chanina ben Gamliel says 5 Dibros on each Luach (5+5) 

2) The Rabonon says 10 on each Luach (10 +10)

3) R. Shimon bar Yochai says 20 on each Luach (20+20).  

10 in the front & 10 in the back of each Luach. 

4) R. Simai says 40  on each Luach (40+40) 

10 Dibros on all 4 sides of each Luach.

The Zohar* holds, like Reb Chanina Ben Gamliel. that it 

had  only 5 Dibros on each Luach.(5+5)

It seems, R.Shimon bar Yochai, 

who said each Luach had 10 Dibros on both sides. (20+20)
would argue on the Zohar who says it had 5 Dibros

on each Luach.

 *Parshas Yisro, Rashi Shir Hashirim # 4:5

So who wrote the Zohar???

Click here to see who the Chasam Sofer said wrote it