The ‘butterfly bush’, not

It struck me this year in my weekly monitoring of butterflies that I didn't see more than an occasional butterfly at a time on buddleia (known as the ‘butterfly bush’) whereas last year I saw on at least 3 occasions more than 10 (comma, peacock, painted ladies, red admiral). It’s all been a bit disappointing this year apart from a flurry of gatekeepers and not on buddleia. Has anyone had a different experience with buddleias this year?