$Proshares做空標普500(SH.US)$ don't understand why always partial fill. is the system working?

Since he will be retiring, I wanted to highlight his unusual trading while in Congress for 40 years.
He became a millionaire many times over on a modest federal salary from trading.
Take a look:
Thomas Carper bought 30k in $做空納斯達克100指數ETF-ProShares(PSQ.US)$ , an ultrashort $納指100ETF-Invesco QQQ Trust(QQQ.US)$ index, on July 13 2023. 
He hedged/shorted in the past with great results with $AdvisorShares主動股票做空ETF(HDGE.US)$ , ...

Since Burry's Q2 filings from 8/14:
Major Indexes:
$SPDR 標普500指數ETF(SPY.US)$ : -3.2%
$納指100ETF-Invesco QQQ Trust(QQQ.US)$ : -2.8%
Inverse ETF's that mirror his puts:
$Proshares做空標普500(SH.US)$ : +2.6%
$做空納斯達克100指數ETF-ProShares(PSQ.US)$ : +2.0%
Anyone else buy alongside him?

Posting to transparently keep tabs on performance
The last confirmed day of Burry's most recent positions was 6/30
Major Indexes since:
$SPDR 標普500指數ETF(SPY.US)$ : -1.0%
$納指100ETF-Invesco QQQ Trust(QQQ.US)$ : -1.6%
Inverse ETF's that mirror his puts:
$Proshares做空標普500(SH.US)$ : +2.3%
$做空納斯達克100指數ETF-ProShares(PSQ.US)$ : +2.5%
$阿里巴巴(BABA.US)$ $標普500指數(.SPX.US)$

Don't look now, but since Burry's filing from Monday
Major Indexes:
$SPDR 標普500指數ETF(SPY.US)$ : -2.3%
$納指100ETF-Invesco QQQ Trust(QQQ.US)$ : -3.1%
Inverse ETF's that mirror his puts:
$Proshares做空標普500(SH.US)$ : +2.3%
$做空納斯達克100指數ETF-ProShares(PSQ.US)$ : +3.1%
Still early but fun to follow along

Don't look now, but since Burry's filing from Monday
Major Indexes:
$SPDR 標普500指數ETF(SPY.US)$ : -2.3%
$納指100ETF-Invesco QQQ Trust(QQQ.US)$ : -3.1%
Inverse ETF's that mirror his puts:
$Proshares做空標普500(SH.US)$ : +2.3%
$做空納斯達克100指數ETF-ProShares(PSQ.US)$ : +3.1%
Still early but fun to follow along

ref: CPI Home : U.S. Bureau of Labor Statistics (bls.gov)
$Proshares做空標普500(SH.US)$ $富途控股(FUTU.US)$ $向上融科(TIGR.US)$ $Roku Inc(ROKU.US)$ $小鵬汽車(XPEV.US)$ $蔚來(NIO.US)$ $特斯拉(TSLA.US)$ $阿里巴巴(BABA.US)$ $Proshares做空標普500(SH.US)$