Shares of Dollar Tree (DLTR -2.48%) are down 14.9% this week as of the market's close on Thursday after the value-oriented retail chain announced weaker-than-expected quarterly results.Why Dollar Tree's "strong" quarter just wasn't enoughFor its fiscal fourth quarter ended Feb. 3, 2024, Dollar Tree's total revenue grew 11.9% year over year to $8.64 billion, including a 3% increase in same-store net sales (note there was an extra week this quarter as compared to the same year-ago period).On the bottom line, ...