I think it is highly likely both marriages are for the same woman.
There doesn't appear to be a birth around 1889 for a Happy Hughes.
On the 1911, Happy Hughes is shown as single, born c1887, so either she wasn't sure of her age, not uncommon, or she gave her age to suit her purposes.
The marriage may have been a disaster or a mistake, so they just parted and carried on as if it had never happened. Again, something which seemingly wasn't uncommon. There was a posting recently in Manchester, where the wife had remarried as a Widow and all the evidence pointed to the husband being alive and well.
But, always say you never know.