DIGG is a rebasing token. When below a DIGG/WBTC ratio of 0.95 it contracts supply. When above 1.05, it expands. This mechanism is how the token drives market actions and encourages the collective market to buy/sell accordingly and return the price of digg closer to the price of wbtc.
The best way to track your DIGG investment in general is to focus on the total supply. Back in May, the total supply was 1360. There have been more negative rebases than positive rebases from then to now, ultimately resulting in a digg supply today of 512. You can see the full history of rebases and supply at digg.finance if you need a reference point. Absent the rewards you are getting from that LP position staked into badger, you would have lost even more, but between the DIGG rewards, DROPT rebase mining, and auto-compounding back into your vault, it has lessened the blow considerably. All that said, yes, you’ve probably lost roughly 30% of your value since May. There are some interesting discussions about the future of DIGG on both the forums and discord, so we hope you’re in it with us for the long haul and excited about revamping and revitalizing DIGG into the long term!
For quicker responses, you can always hop into the discord server, specifically the #rebasing-digg channel, and there are always people around to help explain.