I have my H1B petition valid until December 31, 2018. I recently went for a trip to Mexico on July 7, 2017, via road. I did get an entry stamp from Mexico.
Before leaving the US, my I-94 admit date was January 10, 2019. I re-entered the US on July 9, 2017. I didn't get any stamp on my passport from CBP and there was no update on online of the I-94 when I checked several days later.
Now I am on vacation in India; I left the US on August 18, 2017, and when I checked my I-94, it has an updates that says my last entry was July 9, 2017 and the admit until date as July 10, 2017. Is there an issue with my status?