Empty spaces and no alignment in table

I am trying to create a table. This is the code I am using and I am getting this output. As you can see there are weird cell alignments and I can’t explain the blank spaces in the bottom part either. Help is appreciated.

begin{frame}{Ergebnisse}

begin{table}[]
centering
resizebox{0.9columnwidth}{!}{
    begin{tabular}{|c|c|c|c|c|}
    hline
         textbf{Architektur}                       & textbf{Model}    & textbf{Lhasa-Ü-Tsang}     & textbf{Changdu-Kham}  & textbf{Amdo Pastoral}  hline
         Dialekt-spezfisch                          &                   & 28.83             & 62.56         & 17.6           hline
         makecell{WaveNet-CTC  ohne Dialekt ID}  &                   & 29.55             & 62.83         & 33.52          hline
         makecell{WaveNet-CTC  mit Dialekt ID}   & DialektID-Sprache & 32.84             & 68.58         & 33             cline{2-5}
                                                    & Sprache-DialektID & 26.8              & 64.03         & 30.79          hline 
         makecell{Attention-  WaveNet-CTC}       & DialektID-Sprache & 52.19             & 65.24         & 50.22          cline{2-5} 
                                                    & Sprache-DialektID & 55.16             & 67.78         & 55.23          hline
         makeCell{WaveNet-  Attention-CTC}       & DialektID-Sprache & 21.44             & 60.16         & 20.46          cline{2-5}
                                                    & Sprache-DialektID & 23.79             & 62.96         & 24.15          hline
                                        
    end{tabular}
}
caption{SER(%) des Multitask Modells für Spracherkennung}
end{table}

end{frame}

documentclass{beamer} 
usepackage[ngerman]{babel}
usepackage{tabularx,ragged2e,booktabs,multirow,makecell}
newcolumntype{L}[1]{>{RaggedRighthspace{0pt}hsize=#1hsize}X}
newcolumntype{C}[1]{>{Centeringhspace{0pt}hsize=#1hsize}X}
renewcommandtabularxcolumn[1]{m{#1}}

begin{document}

begin{frame}{SER (%) des Multitask-Modells für Spracherkennung}
small
setlengthtabcolsep{3pt} % default: 6pt
begin{tabularx}{textwidth}{@{} L{1.45} l *{3}{C{0.85}} @{}}
   toprule
   Architektur & Modell & Lhasa-Ü-Tsang & Changdu-Kham & Amdo Pastoral  
   midrule
   Dialekt-spezfisch          & & 28.83 & 62.56 & 17.60  addlinespace
   makecell[l]{WaveNet-CTCohne Dialekt ID}  
                              & & 29.55 & 62.83 & 33.52  addlinespace
   multirow{2}{*}{makecell[l]{WaveNet-CTCmit Dialekt ID}}   
            & DialektID-Sprache & 32.84 & 68.58 & 33.00 
            & Sprache-DialektID & 26.80 & 64.03 & 30.79  addlinespace 
   multirow{2}{*}{makecell[l]{Attention-WaveNet-CTC}}    
            & DialektID-Sprache & 52.19 & 65.24 & 50.22  
            & Sprache-DialektID & 55.16 & 67.78 & 55.23  addlinespace
   multirow{2}{*}{makecell[l]{WaveNet-Attention-CTC}}    
            & DialektID-Sprache & 21.44 & 60.16 & 20.46 
            & Sprache-DialektID & 23.79 & 62.96 & 24.15  
   bottomrule                             
end{tabularx}

end{frame}
end{document}