question about the timestamp of two sensors

each one of them are different, no time synchronization ?
```
R	8.46642	0.0287602   -3.04035	1477010443399637	    8.6	0.25	-3.00029	0
L	8.44818	0.251553	                        1477010443449633   	8.45	0.25	-3.00027	0
R	8.57101	0.0282318   -0.0105258	1477010443499690	    8.45	0.25	0	0
L	8.45582	0.253997	                         1477010443549747	8.45	0.25	0	0
```